5
2.3.2 Connector COM2[RS232] & COM3[RS485]
The 9 Pin, Female, SUB-D, COM2 [RS-232] & COM3 [RS-485] Port on the back of the unit is the
RS-232 and RS485/422 communications port for connecting to a controller.
Connection
Pin Designations
COM2 [RS-232] &
COM3 [RS-485]
Pin assignment of the 9 Pin, Female, SUB-D COM2 [RS-232] & COM3
[RS-485] Port
Pin# Symbol Com2[RS232] Com3[RS485]4w Com3[RS485]2w
1 GND
Signal
Ground
2 Tx+
RS485
Transmit
3 Tx-
RS485
Transmit
4 Rx+
RS485
Receive Data+
5 Rx-
RS485
Receive Data-
6 GND
Signal
Ground
7 RxD
Receive
8 TxD
Transmit
9 Not
used
* The Com3[RS485] 2wire/4wire mode can be set with CECP.(In the Windows CE desktop)
2.3.3 USB Client port
The USB client port for ActiveSync
，
use a USB client to USB host cable connects the USB client port on
MT606 and the USB host port on user’s host PC.
Pin Function
1 N/C
2 USB_DATA-
3 U
4 GND
2.3.4 USB Master port
The USB Master port can connect USB mouse and USB keyboard.
